Title:
DIRECT-CURRENT NEGATIVE DIMMING CIRCUIT AND LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/152924
Kind Code:
A1
Abstract:
A direct-current negative dimming circuit (100), for converting first dimming signals outputted by a main chip of a liquid crystal display device to second dimming signals and outputting the second dimming signals to a backlight module, comprising first and second electric switches (Q1, Q2), and first to third resistors (R1, R2, R3). A control end of the first electric switch (Q1) is connected to a dimming signal output end of the main chip by means of the first resistor (R1) to receive the first dimming signals, a first end of the first electric switch (Q1) is connected to a voltage end (VREF) by means of the second resistor (R2) to receive first high-level signals, and a second end of the first electric switch (Q1) is connected to a control end of the second electric switch (Q2). A first end of the second electric switch (Q2) is connected to a dimming signal receiving end of the backlight module to output second dimming signals and is grounded by means of the third resistor (R3), and a second end of the second electric switch (Q2) receives second high-level signals, the levels of the first and second dimming signals are opposite. Therefore, the first dimming signals of the main chip are converted to second dimming signals to be directly supplied to the backlight module so as to satisfy the requirements of the liquid crystal display device to the direct-current negative dimming.
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Inventors:
LI WENDONG (CN)
Application Number:
PCT/CN2017/078633
Publication Date:
August 30, 2018
Filing Date:
March 29, 2017
Export Citation:
Assignee:
SHENZHEN CHINA STAR OPTOELECT (CN)
International Classes:
G09G3/36; G09G3/34; H05B44/00
Foreign References:
| CN102833916A | 2012-12-19 | |||
| KR20130015852A | 2013-02-14 | |||
| CN102325401A | 2012-01-18 | |||
| EP2843650A1 | 2015-03-04 | |||
| CN103310740A | 2013-09-18 | |||
| CN105282907A | 2016-01-27 |
Attorney, Agent or Firm:
SCIHEAD IP LAW FIRM (CN)
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